Molecular crystal, electrochemical device, and method for producing molecular crystal

Abstract

A molecular crystal with lithium ion conductivity is disclosed. The molecular crystal of the present disclosure includes sulfolane and a lithium salt represented by the following chemical formula and the molar ratio of said sulfolane to said lithium salt is 2.0 or more and less than 3.0.

1 . A molecular crystal, comprising a sulfolane and a lithium salt represented by the following chemical formula (1), wherein
 a molar ratio of the sulfolane to the lithium salt is 2.0 or more and 3.1 or less.   
       
         
           
           
               
               
           
         
       
     
     
         2 . The molecular crystal according to  claim 1 , having a hexagonal structure. 
     
     
         3 . The molecular crystal according to  claim 1 , wherein
 the molar ratio of the sulfolane to the lithium salt is 2.0 or more and less than 3.0.   
     
     
         4 . An electrochemical device, comprising: an ionic conductor, wherein
 the ionic conductor has a molecular crystal according to  claim 1 .   
     
     
         5 . A method for producing a molecular crystal, the method comprising:
 mixing sulfolane and a lithium salt represented by the following chemical formula (1) to obtain a solution containing the sulfolane and the lithium salt and having a molar ratio of the sulfolane to the lithium salt of 2.0 or more and 3.1 or less, and   cooling the solution to obtain the molecular crystal.